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using System;
using System.Diagnostics;
namespace LibNoise.Operator
{
/// <summary>
/// Provides a noise module that maps the output value from a source module onto an
/// exponential curve. [OPERATOR]
/// </summary>
public class Exponent : ModuleBase
{
#region Fields
private double _exponent = 1.0;
#endregion
#region Constructors
/// <summary>
/// Initializes a new instance of Exponent.
/// </summary>
public Exponent()
: base(1)
{
}
/// <summary>
/// Initializes a new instance of Exponent.
/// </summary>
/// <param name="input">The input module.</param>
public Exponent(ModuleBase input)
: base(1)
{
Modules[0] = input;
}
/// <summary>
/// Initializes a new instance of Exponent.
/// </summary>
/// <param name="exponent">The exponent to use.</param>
/// <param name="input">The input module.</param>
public Exponent(double exponent, ModuleBase input)
: base(1)
{
Modules[0] = input;
Value = exponent;
}
#endregion
#region Properties
/// <summary>
/// Gets or sets the exponent.
/// </summary>
public double Value
{
get { return _exponent; }
set { _exponent = value; }
}
#endregion
#region ModuleBase Members
/// <summary>
/// Returns the output value for the given input coordinates.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <param name="z">The input coordinate on the z-axis.</param>
/// <returns>The resulting output value.</returns>
public override double GetValue(double x, double y, double z)
{
Debug.Assert(Modules[0] != null);
var v = Modules[0].GetValue(x, y, z);
return (Math.Pow(Math.Abs((v + 1.0) / 2.0), _exponent) * 2.0 - 1.0);
}
#endregion
}
}
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